Cream together butter and sugars. Add the vanilla and egg
yolk. Sift together the flour and salt, and add it one cup at a time
until completely incorporated. BY HAND fold in the chocolate
chips. Doing so with the mixer tends to break up the chocolate chips.

Preheat oven to 350 degrees. Chill dough for at least 30 minutes. Roll dough on floured work surface and use cookie cutters to cut shapes. Bake for 10-12 min. at 350.